制造战略研究:现状、问题及趋势

制造战略从战略的角度审视企业的制造职能,认为企业的制造竞争力是企业赢得竞争优 势的有力武器. 对制造战略的概念、研究领域进行了总结,分析了制造战略研究和实践中存在 的问题,结合战略管理研究的趋势和企业竞争新的特点,提出了制造战略研究的趋势.     

老龄人才资源开发研究：以成都市为例

本文在我国人口老龄化背景下以成都市为例,对老龄人再就业问题进行了调查研究,结果发现目前在老龄人再就业过程中普遍存在社会舆论压力大、年龄歧视问题突出、子女态度制约以及再就业信息匮乏等问题,从而为老龄人才资源的开发构成了障碍。本文认为我们应通过设立弹性退休年龄制度,加强信息渠道建设,强化舆论宣传,建立老龄人才资源库等途径完善老龄人才的再就业环境,促进老龄人才资源的有效开发。     

企业实施战略管理会计的必要性和可行性

以知识经济和网络革命为背景,着眼于企业全球竞争和战略管理的迫切需要,对我国实施战略管理会计的必要性和可行性作一初步的思考。     

The Ornstein-Uhlenbeck Dirichlet process and other time-varying processes for Bayesian nonparametric inference

This paper introduces a new class of time-varying, measure-valued stochastic processes for Bayesian nonparametric inference. The class of priors is constructed by normalising a stochastic process derived from non-Gaussian Ornstein-Uhlenbeck processes and generalises the class of normalised random measures with independent increments from static problems. Some properties of the normalised measure are investigated. A particle filter and MCMC schemes are described for inference. The methods are applied to an example in the modelling of financial data.     

Leverage analysis for linear mixed models

We consider a generalized leverage matrix useful for the identification of influential units and observations in linear mixed models and show how a decomposition of this matrix may be employed to identify high leverage points for both the marginal fitted values and the random effect component of the conditional fitted values. We illustrate the different uses of the two components of the decomposition with a simulated example as well as with a real data set.     

SB-robustness of directional mean for circular distributions

In this paper we study the robustness of the directional mean (a.k.a. circular mean) for different families of circular distributions. We show that the directional mean is robust in the sense of finite standardized gross error sensitivity (SB-robust) for the following families: (1) mixture of two circular normal distributions, (2) mixture of wrapped normal and circular normal distributions and (3) mixture of two wrapped normal distributions. We also show that the directional mean is not SB-robust for the family of all circular normal distributions with varying concentration parameter. We define the circular trimmed mean and prove that it is SB-robust for this family. In general the property of SB-robustness of an estimator at a family of probability distributions is dependent on the choice of the dispersion measure. We introduce the concept of equivalent dispersion measures and prove that if an estimator is SB-robust for one dispersion measure then it is SB-robust for all equivalent dispersion measures. Three different dispersion measures for circular distributions are considered and their equivalence studied.     

Mixed models for data from thorough QT studies: part 1. assessment of marginal QT prolongation

We investigate mixed models for repeated measures data from cross-over studies in general, but in particular for data from thorough QT studies. We extend both the conventional random effects model and the saturated covariance model for univariate cross-over data to repeated measures cross-over (RMC) data; the resulting models we call the RMC model and Saturated model, respectively. Furthermore, we consider a random effects model for repeated measures cross-over data previously proposed in the literature. We assess the standard errors of point estimates and the coverage properties of confidence intervals for treatment contrasts under the various models. Our findings suggest: (i) Point estimates of treatment contrasts from all models considered are similar; (ii) Confidence intervals for treatment contrasts under the random effects model previously proposed in the literature do not have adequate coverage properties; the model therefore cannot be recommended for analysis of marginal QT prolongation; (iii) The RMC model and the Saturated model have similar precision and coverage properties; both models are suitable for assessment of marginal QT prolongation; and (iv) The Akaike Information Criterion (AIC) is not a reliable criterion for selecting a covariance model for RMC data in the following sense: the model with the smallest AIC is not necessarily associated with the highest precision for the treatment contrasts, even if the model with the smallest AIC value is also the most parsimonious model.     

THE RELATIONSHIPS BETWEEN SKEWNESS AND KURTOSIS

Theoretical considerations of kurtosis, whether of partial orderings of distributions with respect to kurtosis or of measures of kurtosis, have tended to focus only on symmetric distributions. With reference to historical points and recent work on skewness and kurtosis, this paper defines anti-skewness and uses it as a tool to discuss the concept of kurtosis in asymmetric univariate distributions. The discussion indicates that while kurtosis is best considered as a property of symmetrised versions of distributions, symmetrisation does not simply remove skewness. Skewness, anti-skewness and kurtosis are all inter-related aspects of shape. The Tukey g and h family and the Johnson Su family are considered as examples.     

大力加强公共文化服务体系建设的战略思考

建立公共文化服务体系是全面建设小康社会、构建社会主义和谐社会的必然要求,是维护好、实现好、发展好人民群众基本文化权益的主要途径。政府应从“以人为本、面向基层、服务群众”的角度出发,积极探索公共文化体系建设的新途径与方式方法,以更好地满足人民群众对日益增长文化需求。